untreated

adjective

un·​treat·​ed ˌən-ˈtrē-təd 

: not treated

untreated wastewater

especially : not improved or controlled medically

an untreated case of pneumonia

untreated diabetic patients

Synonyms of untreated

• crude
• unprocessed
• natural
• raw
• native

Examples of untreated in a Sentence

untreated wool

Recent Examples on the Web

The complications stemmed from untreated diabetes, according to an affidavit from the Kansas Bureau of Investigation. —Caroline Zimmerman, Kansas City Star, 11 Apr. 2026

Symptoms normally begin 10 days to two weeks after exposure and last two to three weeks if untreated. —Don Sweeney april 8, Sacbee.com, 8 Apr. 2026

In some cases, Prime officials said, patients have reportedly left Prime hospital emergency departments, against the advice of doctors, with untreated medical conditions due to lengthy transfer wait times. —Tony Saavedra, Oc Register, 7 Apr. 2026

Strikingly, older mice treated with the peptide can run for twice as long as their untreated counterparts. —Dhruv Khullar, New Yorker, 6 Apr. 2026

Word History

First Known Use

15th century, in the meaning defined above

Rhymes for untreated

• accreted
• competed
• completed
• conceited
• concreted
• defeated
• deleted
• depleted
• entreated
• intreated
• maltreated
• mistreated

Medical Definition

untreated

adjective

un·​treat·​ed -ˈtrēt-əd 

: not subjected to treatment

an untreated disease